In statistics, the quartile coefficient of dispersion is a descriptive statistic which measures dispersion and which is used to make comparisons within and between data sets.
The statistic is easily computed using the first (Q1) and third (Q3) quartiles for each data set. The quartile coefficient of dispersion is:
Example
Consider the following two data sets:
A = {2, 4, 6, 8, 10, 12, 14} B = {1.8, 2, 2.1, 2.4, 2.6, 2.9, 3}The quartile coefficient of dispersion of data set A is 2.7 times as great (0.5 / 0.18) as that of data set B.
References
Quartile coefficient of dispersion Wikipedia(Text) CC BY-SA